If you would like to go dual disc on a BT Raven 7.0 with a Zoo pitbull fork and you want to use 180mm rotors, do you have to use the Hope +20 adapter for the calipers or is there calipers that would fit right on. I would prefer not to use any adaptors if thats possible, and is there any diffrens between front and rear except that the levers are vice versa.